Help!!!

Henry intends to retire in 14 years and would like to receive $2472 every six months for 19 years starting on the date of his retirement. How much must Henry deposit in an account today if interest is 6.65% compounded semi-annually?

You need a couple of important formulas for this problem.
If you don't know them, I don't see how you can expect to solve it.

Henry intends to retire in 14 years and would like to receive $2472
every six months for 19 years starting on the date of his retirement.
How much must Henry deposit in an account today
if interest is 6.65% compounded semi-annually?

Upon his retirement, he must have A dollars investing in a "sinking fund".
It will earn 6.65% interest compounded semi-annually and allow him to
withdraw $2472 every six months for 19 years before the funds are depleted.